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Search: id:A128032
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| A128032 |
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Numbers n such that (19^n - 3^n)/16 is prime. |
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20
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OFFSET
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1,1
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COMMENT
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All terms are primes.
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MATHEMATICA
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k=16; Select[ Prime[ Range[1, 200] ], PrimeQ[ ((k+3)^# - 3^#)/k ]& ]
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CROSSREFS
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Cf. A028491 = numbers n such that (3^n - 1)/2 is prime. Cf. A057468 = numbers n such that 3^n - 2^n is prime. Cf. A059801 = numbers n such that 4^n - 3^n is prime. Cf. A121877 = numbers n such that (5^n - 3^n)/2 is a prime. Cf. A128024, A128025, A128026, A128027, A128028, A128029, A128030, A128031.
Sequence in context: A140039 A071392 A142434 this_sequence A142489 A033244 A140857
Adjacent sequences: A128029 A128030 A128031 this_sequence A128033 A128034 A128035
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KEYWORD
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hard,more,nonn,bref
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AUTHOR
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Alexander Adamchuk (alex(AT)kolmogorov.com), Feb 11 2007
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EXTENSIONS
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2711 from Farideh Firoozbakht (mymontain(AT)yahoo.com), Apr 07 2007
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